@article{ref1,
title="Effects of helicopter service on survival after trauma. Design of study predisposed to type II error",
journal="British medical journal: BMJ",
year="1995",
author="Maclean, A. D. and Kirk, C. J. and Coats, T. J. and Cross, F. W.",
volume="311",
number="7013",
pages="1165; author reply 1166-1165; author reply 1166",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0959-8138",
doi="",
url="http://dx.doi.org/"
}